기선간 공분산 모델링이 GPS 망조정에 미치는 영향 = On the Effect of Inter-baseline Covariance in the Network-based GPS Positioning

다국어 초록 (Multilingual Abstract)

In this study, the impact of the covariance between the baselines on the network-based GPS positioning is analyzed. For the analysis, the multi-baseline solutions with properly modeled covariance between the baselines and the combined solutions from the single-baseline solutions are obtained, respectively. Then, the accuracies of both solutions are evaluated in terms of coordinate residuals, i.e., the differences between the positioning solutions and the published stations` coordinates. The results indicate that the positioning accuracy in static mode depends much on the geometry of GPS satellites rather than the proper modeling of covariance between the baselines. Also, slight but negligible improvement in positioning accuracy is observed in static solutions. Therefore, one may use combined solutions as an alternative to multi-baseline solutions for the network-based GPS positioning. However, multi-baseline solution with properly modeled covariance between the baselines is recommended to use especially for the applications to detect very small displacement, i.e., deformation of the building or bridge.

참고문헌 (Reference)

1 양효진, "전리층 효과의 통계적 모델을 이용한 중기선 정지측위" 서울시립대학교 2007

2 전재한, "시뮬레이션을 통한 GPS 품질관리에 관한 연구" 서울시립대학교 2008

3 국토해양부 국토지리정보원, "국가기준점 망조정에 관한 연구"

4 B.Hofmann-Wellenhof, "Global Positioning System Theory and Practice" Springer-Verlag Wien New York 189-202, 2001

5 Hong, Chang-Ki, "Efficient Differential Code Bias and Ionosphere Modeling and Their Impact on The Network-Based GPS Positioning" 11 : 114-120, 2007

6 Grejner-Brzezinska, D, "Analysis of GPS Data Processing Techniques: In Search of Optimized Strategy of Orbit and Earth Rotation Parameter Recovery" The Ohio State University 1995